24mm crowfoot wrench, ratchet or breaker, long extension, get the wrench on the bottom of the old pump, turn CCW and remove. Easy as pie. 17mm crowfoot installs the new one. Yes, you need the crowfoot. Buy a cheap set or borrow somebody's, but it's a 2 minute no-hassle affair with a crowfoot. You can use stubby open end wrenches too, but nuthin' beats the crowfoot for this job.
Some on this forum will advise you to just grab it with a set of vice-grips. That method lacks finesse, and is destructive to the old pump. Mine wasn't leaking when I replaced it so I still have it.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)